taxonID	type	description	language	source
03E787C1FFE8FF9AFF6BFCBAFA52F81B.taxon	materials_examined	Type species. Calosargus (Calosargus) tatianae Mostovski, 1997 Stratigraphic and geographic range. The Middle / Upper Jurassic; Kazakhstan, China.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE8FF9AFF6BFCBAFA52F81B.taxon	diagnosis	Diagnosis. Subgenus Calosargus Mostovski, 1997 differs from subgenus Pterosargus Mostovski, 1997 in veins M 1 and M 2 distinctly separated at base, vein M 3 absent, and cell br nearly as wide as cell bm.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE8FF9AFF6BFE23FA8EFD1F.taxon	materials_examined	Type species. Calosargus (Calosargus) tatianae Mostovski, 1997.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE8FF9AFF6BFE23FA8EFD1F.taxon	diagnosis	Diagnosis. Head round, antennal flagellum bristle-like (if preserved). Wing slender; vein Sc ending far beyond middle of wing; vein R 1 long; vein R 2 + 3 ending at vein R 1 before wing margin, vein R 5 ending at (or beyond) wing apex; vein CuA 1 arising from cell d; vein CuP present, vein CuA 2 short; cell sc and cell r 4 wide open, cell r 4 short, cell d large, and cell cup narrowly open (Mostovski 1997, Nagatomi & Yang 1998).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFEBFF9FFF6BFF36FC1AF9EB.taxon	diagnosis	Diagnosis. Vei n R s 1 about twice as long as vein Rs 2; vein R 2 + 3 arising slightly distal of base of cell d; vein R 2 + 3 ending at vein R 1 near wing margin; crossvein r-m located at about basal 2 / 5 of cell d.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFEBFF9FFF6BFF36FC1AF9EB.taxon	etymology	Etymology. The specific name refers to the Latins bellus (pretty).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFEBFF9FFF6BFF36FC1AF9EB.taxon	materials_examined	Holotype. CNU-DB-NN 2007004, an almost complete male with both wings in dorsal view. Paratype. Part and counterpart CNU-DB-NN 2007005, CNU-DB-NN 2007006, an almost complete adult body with both wings in lateral view. Type locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, the Middle Jurassic (Aalenian-Bajocian).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFEBFF9FFF6BFF36FC1AF9EB.taxon	description	Description. Body length 17.3 – 17.6 mm; wing length 9.4 – 10.3 mm, wing width 2.8 – 2.9 mm. Head round, slightly narrower than thorax. Eyes large, bare, dichoptic; ommatidia visible clearly. Thorax black. Legs pubescent. Fore and mid tibiae slender; hind tibia with 1 spur, femur long, robust; first tarsomere distinctly longer than following tarsomeres. Wing hyaline: Crossvein h sometimes slant. Vein C ending at wing tip; veins C, Sc and R 1 markedly thick; vein Sc long, extending far beyond middle of wing. Ve in R 1 long and robust; vein Rs 1 arising from middle of wing, about twice as long as vein Rs 2; vein R 2 + 3 arising slightly distal of base of cell d; vein R 2 + 3 ending at vein R 1 near wing margin; veins R 4 and R 5 short; vein R 5 ending far beyond apex of wing, relative lengths of veins Rs 3, R 4 and R 5 about 6: 3: 4. Crossvein r-m located at basal 2 / 5 of cell d. Vein M 3 absent, vein CuA 1 arising from cell d. Vein CuP present. Cell sc wide open, mouth of cell sc about 3 times as wide as that of cell r 4, mouth of cell r 1 narrow, mouth of cell r 4 about twice as wide as that of cell r 1. Cell br nearly as large as cell bm. Cell d short and wide; base of cell m 1 about 1 / 3 – 1 / 5 as wide as that of cell m 2; mouth of cell m 1 nearly as wide as that of cell m 2. Mouth of cua 1 wide open, about 7 times as wide as that of cell cup. Halter well-developed. Abdomen slender, narrowing toward tip, covered with setulae. Eight segments visible. Segment I evidently short. Segments I and II with wide black stripe at middle. Segments II to VII with distinct stria at side.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFEBFF9FFF6BFF36FC1AF9EB.taxon	discussion	Remarks. C. (C.) bellus sp. nov. looks like C. (C.) tatianae Mostovski, 1997 very much in the following aspects: vein Rs 1 long, about twice as long as vein Rs 2; vein R 2 + 3 arising slightly distal of base of cell d; cell d wide, crossvein r-m located at basal 2 / 5 of cell d; mouth of cell m 1 slightly wider than that of cell m 2. However, it can be easily separated from the latter by vein R 2 + 3 long, ending at vein R 1 near wing margin, and base of cell m 1 about 1 / 3 – 1 / 5 as wide as that of cell m 2. In tatianae, vein R 2 + 3 is short, ending at vein R 1 far before wing margin; the base of cell m 1 is about 1 / 2 as wide as that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFECFF93FF6BF912FB81FC8F.taxon	diagnosis	Diagnosis. Flagellum bristle-like; vein Rs 1 about twice as long as vein Rs 2; vein R 2 + 3 arising slightly distal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; crossvein r-m nearly located at middle of cell d.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFECFF93FF6BF912FB81FC8F.taxon	etymology	Etymology. The specific name refers to the Latin: antiquus (ancient).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFECFF93FF6BF912FB81FC8F.taxon	materials_examined	Holotype. CNU-DB-NN 2007007, female, an almost complete adult body with both wings in dorsal view. Type locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, the Middle Jurassic (Aalenian-Bajocian).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFECFF93FF6BF912FB81FC8F.taxon	description	Description. Body length 16 mm; wing length 7.2 mm, wing width 2.3 mm. Head subround, slightly narrower than thorax. Eyes large, bare; ommatidia visible clearly. Flagellum bristle-like. Hind femur robust and distinctly swollen; tibia slender. Wing hyaline: Vein C ending at wing tip; veins C, Sc and R 1 markedly thick; vein Sc long, extending beyond middle of wing. Vein R 1 long and robust; vein Rs 1 arising from middle of wing, about twice as long as vein Rs 2; vein R 2 + 3 arising slightly distal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; veins R 4 and R 5 short; vein R 5 ending far beyond apex of wing, relative lengths of veins Rs 3, R 4 and R 5 about 6: 3: 4. Crossvein r-m nearly located at middle of cell d. Ve in M 3 absent, vein CuA 1 arising from cell d. Vein CuP present. Cell sc wide open, mouth of cell sc about 3 times as wide as that of cell r 4, mouth of cell r 1 narrow, mouth of cell r 4 about twice as wide as that of cell r 1. Cell br nearly as large as cell bm. Cell d wide; base of cell m 1 about 1 / 2 as wide as that of cell m 2; mouth of cell m 1 nearly as wide as that of cell m 2. Mouth of cua 1 wide open, about 5 times as wide as that of cell cup. Abdomen cylindrical, covered with setulae. Nine segments visible; segment I evidently short. Segments II to VII with distinct stria at side. Segments III to VI with wide black stripe at each end. Ovipositor tapering.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFECFF93FF6BF912FB81FC8F.taxon	discussion	Remarks. C. (C.) antiquus sp. nov. could be related to C. (C.) tatianae Mostovski, 1997 in the following aspects: vein Rs 1 long, about twice as long as vein Rs 2; vein R 2 + 3 arising slightly distal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; base of cell m 1 about 1 / 2 as wide as that of cell m 2. However, it can be easily separated from the latter by the shorter apical part of vein R 1 (from ending of vein R 2 + 3 to wing margin), shorter veins R 4 and R 5, wider crossvein r-m, and sharper base of cell d.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE1FF92FF6BFC2AFBBDF8A1.taxon	diagnosis	Diagnosis. Vei n R s 1 short, nearly as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; crossvein r-m located at basal 1 / 3 of cell d; mouth of cell r 1 narrow, about 1 / 4 as wide as that of cell r 4; mouth of cell m 1 narrower than that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE1FF92FF6BFC2AFBBDF8A1.taxon	etymology	Etymology. The specific name refers to the type locality: Daohugou village, Inner Mongolia, China.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE1FF92FF6BFC2AFBBDF8A1.taxon	materials_examined	Holotype. CNU-DB-NN 2007008, an almost complete adult of unknown sex with wing in lateral view. Type locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, Middle Jurassic (Aalenian-Bajocian).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE1FF92FF6BFC2AFBBDF8A1.taxon	description	Description. Body length 8.0 mm; wing length 7.8 mm, wing width 2.5 mm. Head round in lateral view, slightly narrower than thorax. Eyes large, bare; ommatidia visible clearly. Thorax black. Middle and hind femora long, slightly swollen; hind tibia slender. Wing elongate, hyaline. Vein C ending at wing tip; veins C and R 1 markedly thick; vein Sc long, extending far beyond middle of wing. Ve in R 1 long and robust; vein Rs 1 short, nearly as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; vein R 4 short, convergent to vein R 1; vein R 5 ending far beyond apex of wing, relative lengths of vein R 5 and vein Rs 3 about 3: 5. Crossvein r-m located at basal 1 / 3 of cell d. Vein M 3 absent, vein CuA 1 arising from cell d. Cell sc wide open, mouth of cell sc about 3 times as wide as that of cell r 4, mouth of cell r 1 narrow, about 1 / 4 as wide as that of cell r 4. Cell d wide, mouth of cell m 1 narrower than that of cell m 2. Abdomen slender, cylindrical. Three segments visible. Segment I evidently short.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE1FF92FF6BFC2AFBBDF8A1.taxon	discussion	Remarks. C. (C.) daohugouensis sp. nov. could be related to C. (C.) antiquus sp. nov. in the following aspects: vein R 2 + 3 ending at vein R 1 far before wing margin; veins R 4 and R 5 short; base of cell d sharp. However, we can easily separate it from antiquus by vein Rs 1 short, nearly as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; crossvein r-m located at basal 1 / 3 of cell d; veins M distinctly long; mouth of cell r 1 about 1 / 4 as wide as that of cell r 4; mouth of cell m 1 narrower than that of cell m 2. In antiquus, vein Rs 1 is long, about twice as long as vein Rs 2; vein R 2 + 3 is arising slightly distal of the base of cell d; crossvein rm is nearly located at middle of cell d; the branches of vein M are distinctly short; the mouth of cell r 1 is about 1 / 2 as wide as that of cell r 4; the mouth of cell m 1 is nearly as wide as that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE0FF90FF6BF8FBFDFBF8D1.taxon	diagnosis	Diagnosis. Vei n R s 1 short, nearly as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; relative lengths of vein R 5 and vein Rs 3 about 3: 5; crossvein rm located at basal 1 / 3 of cell d; cell d slender; base of cell m 2 about 3.5 times as wide as that of cell m 1; mouth of cell m 1 nearly as wide as that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE0FF90FF6BF8FBFDFBF8D1.taxon	etymology	Etymology. The specific name refers to the Latin tenuis (narrow) and cellulatus (cell), referring to the slender cell d.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE0FF90FF6BF8FBFDFBF8D1.taxon	materials_examined	Holotype. CNU-DB-NN 2007009, an almost complete adult body with wing in dorsal view. Type locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, Middle Jurassic (Aalenian-Bajocian).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE0FF90FF6BF8FBFDFBF8D1.taxon	description	Description. Body length 10.7 mm; wing length 9.0 mm, wing width 2.3 mm. Head round in dorsal view, slightly narrower than thorax. Eyes large, bare, holoptic; ommatidia visible clearly. Thorax black. Hind femur distinctly swollen; hind tibia slender, slightly longer than femur, first tarsomere of hind leg distinctly longer than following tarsomeres. Wing elongate, hyaline. Vein C ending at apex of vein R 5; veins C and R 1 markedly thick; vein Sc long, extending far beyond middle of wing. Vein R 1 long and robust; vein Rs 1 short, near as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; vein R 4 short; vein R 5 ending far beyond apex of wing, relative lengths of vein R 5 and vein Rs 3 about 3: 5. Crossvein r-m located at basal 1 / 3 of cell d. Vein M 3 absent, vein CuA 1 arising from cell d. Vein Cup present. Cell sc wide open, apex of cell sc about 3 times as wide as that of cell r 4, apex of cell r 4 about twice as wide as that of cell r 1. Cell d slender, longer than vein M 1 in length; base of cell m 2 about 3.5 times as wide as that of cell m 1; apex of cell m 1 slightly wider than that of cell m 2. Cell cup narrow open, about 1 / 4 as wide as that of cell cua 1. Abdomen brown, slender, cylindrical; five segments visible. Segment I evidently short. Segments II to V with distinct stria at side. Segments III to V with wide black stripe at each end. Gender unknown.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE0FF90FF6BF8FBFDFBF8D1.taxon	discussion	Remarks. C. (C.) tenuicellulatus sp. nov. could be related to C. (C.) daohugouensis sp. nov. in the following aspects: vein Rs 1 short, nearly as long as vein Rs 2; relative lengths of vein R 5 and vein Rs 3 about 3: 5; crossvein r-m located at basal 1 / 3 of cell d. However, it can be easily separated from the latter by the mouth of cell r 4 about twice as wide as that of cell r 1, cell d slender, longer than vein M 1 in length, base of cell m 2 about 3.5 times as wide as that of cell m 1, mouth of cell m 1 slightly longer than that of cell m 2. In daohugouensis, the mouth of cell r 4 is about 4 times as wide as that of cell r 1; cell d is wider, slightly shorter than vein M 1; the base of cell m 2 is about twice as wide as that of cell m 1; the mouth of cell m 1 is shorter than that of cell m 2. Meanwhile, C. (C.) tenuicellulatus sp. nov. is also very similar to C. (C.) validus sp. nov. See the remarks of C. (C.) validus sp. nov. in detail.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE5FF95FF6BFF36FDEDFE15.taxon	diagnosis	Diagnosis. Vei n R s 1 short, nearly as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; crossvein r-m nearly located at basal part of cell d; mouth of cell r 4 about twice as wide as that of cell r 1; mouth of cell m 1 nearly as wide as that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE5FF95FF6BFF36FDEDFE15.taxon	etymology	Etymology. The specific name refers to the Latin: validus (vigorous).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE5FF95FF6BFF36FDEDFE15.taxon	materials_examined	Holotype. CNU-DB-NN 2007010, an almost complete adult body with both wings in dorsal view. Paratype. Part and counterpart CNU-DB-NN 2007011, CNU-DB-NN 2007012, an almost complete male adult body with both wings in dorsal view. Type locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, the Middle Jurassic (Aalenian-Bajocian).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE5FF95FF6BFF36FDEDFE15.taxon	description	Description. Body length 14.5 – 17.8 mm; wing length 8.5 – 8.7 mm, wing width 2.6 mm. Head subround, slightly narrower than thorax. Eyes large, bare; ommatidia visible clearly. Thorax black. Hind femur long and distinctly swollen at apex. Wing hyaline. Vein C ending at wing tip; veins C, Sc and R 1 markedly thick; vein Sc long, extending far beyond middle of wing. Vein R 1 long and robust; vein Rs 1 arising from middle of wing, nearly as long as vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; veins R 4 and R 5 short; vein R 5 ending far beyond apex of wing, relative lengths of veins Rs 3, R 4 and R 5 about 10: 6: 7. Crossvein r-m nearly located at basal 1 / 3 – 2 / 5 of cell d. Vein M 3 absent, vein CuA 1 arising from cell d. Vein CuP present. Cell sc wide open, mouth of cell sc about 3 times as wide as that of cell r 4, mouth of cell r 1 narrow, mouth of cell r 4 about twice as wide as that of cell r 1. Cell br nearly as large as cell bm. Cell d wide; base of cell m 1 about 1 / 2 – 2 / 3 as wide as that of cell m 2; mouth of cell m 1 nearly as wide as that of cell m 2. Mouth of cua 1 wide open, about 5 – 6 times as wide as that of cell cup. Abdomen cylindrical, covered with setulae. Nine segments visible; segment I evidently short. Segments II to VII with distinct stria at side. Segments II to VI with wide black stripe at each end.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE5FF95FF6BFF36FDEDFE15.taxon	discussion	Remarks. C. (C.) validus sp. nov. could be related to C. (C.) daohugouensis sp. nov. in the following aspects: vein Rs 1 short, nearly as long as vein Rs 2, vein R 2 + 3 ending at vein R 1 far before wing margin, base of cell m 1 about 1 / 2 as wide as that of cell m 2. However, it can be easily separated from the latter by apex of cell r 4 about twice as wide as that of cell r 1, and apex of cell m 1 nearly as wide as that of cell m 2. In daohugouensis, the apex of cell r 4 is about 4 times as wide as that of cell r 1; the apex of cell m 1 is narrower than that of cell m 2. Meanwhile, C. (C.) validus sp. nov. is also similar to C. (C.) tenuicellulatus sp. nov. in the robust body, vein Rs 1 short, nearly as long as vein Rs 2, vein R 2 + 3 arising slightly proximal of base of cell d, vein R 2 + 3 ending at vein R 1 far before wing margin, apex of cell r 4 about twice as wide as that of cell r 1. However, it can be easily separated from the latter by cell d wider, base of cell m 2 about 1.5 – 2 times as wide as that of cell m 1, and apex of cell m 1 nearly as wide as that of cell m 2. In tenuicellulatus, crossvein r-m is located at basal 1 / 3 of cell d; cell d is slender; the base of cell m 2 is about 3.5 times as wide as that of cell m 1; the apex of cell m 1 is slightly wider than that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE7FF94FF6BFDB0FA50FA46.taxon	diagnosis	Diagnosis. A spurious crossvein present between veins R 1 and R 2 + 3; vein Rs 1 slightly longer than vein Rs 2; vein R 2 + 3 ending at vein R 1 far before wing margin; mouth of cell r 4 about twice as wide as that of cell r 1; base of cell m 1 about 1 / 3 as wide as that of cell m 2; mouth of cell m 1 slightly narrower than that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE7FF94FF6BFDB0FA50FA46.taxon	etymology	Etymology. The specific name refers to collector of this specimen: Mr. Gang Han. Holotype. CNU-DB-NN 2007013, an almost complete adult body with wings in lateral view.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE7FF94FF6BFDB0FA50FA46.taxon	materials_examined	Type locality and horizon. Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China; Jiulongshan Formation, the Middle Jurassic (Aalenian-Bajocian).	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE7FF94FF6BFDB0FA50FA46.taxon	description	Description. Body length 16 mm; wing length about 9 mm, wing width about 2.2 mm. Head subround, slightly narrower than thorax. Eyes large, bare; ommatidia visible clearly. Fore and mid legs short and thin; hind femur distinctly long and robust; tibiae slender. Wing hyaline, slen- der. Vein C ending at wing tip; veins C, Sc and R 1 markedly thick; vein Sc long, extending far beyond middle of wing. Vein R 1 long and robust; a spurious crossvein present between veins R 1 and R 2 + 3; vein Rs 1 arising from middle of wing, slightly longer than vein Rs 2; vein R 2 + 3 arising slightly proximal of base of cell d; vein R 2 + 3 ending at vein R 1 far before wing margin; veins R 4 and R 5 short; vein R 5 ending far beyond apex of wing, relative lengths of veins Rs 3, R 4 and R 5 about 7: 3: 4. Crossvein r-m nearly located at basal 1 / 3 of cell d. Vein M 3 absent, vein CuA 1 arising from cell d. Vein CuP present. Cell sc wide open, mouth of cell sc about 4 times as wide as that of cell r 4, mouth of cell r 1 narrow, mouth of cell r 4 about twice as wide as that of cell r 1. Cell br nearly as large as cell bm. Cell d slender; base of cell m 1 about 1 / 3 as wide as that of cell m 2; mouth of cell m 1 slightly narrower than that of cell m 2. Mouth of cua 1 wide open. Abdomen cylindrical, covered with setulae. Seven segments visible; segment I evidently short.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
03E787C1FFE7FF94FF6BFDB0FA50FA46.taxon	discussion	Remarks. C. (C.) hani sp. nov. is more or less similar to C. (C.) tenuicellulatus sp. nov. However, it can be easily separated from the latter by the distinctly slender wing and cell d, vein Rs 1 slightly longer than that of vein Rs 2, an excrescent crossvein located between veins R 1 and R 2 + 3, and mouth of cell m 1 slightly narrower than that of cell m 2. In tenuicellulatus, the wing and cell d are wider than in hani; vein Rs 1 is short, nearly as long as vein Rs 2; an excrescent crossvein is absent; the mouth of cell m 1 is slightly longer than that of cell m 2.	en	Zhang, Kuiyan, Yang, Ding, Shih, Dong Ren Chungkun (2007): The oldest Calosargus Mostovski, 1997 from the Middle Jurassic of China (Diptera: Brachycera: Archisargidae). Zootaxa 1645: 1-17, DOI: 10.5281/zenodo.179727
